SW series Impedance Tubes can accurately measure sound absorption coefficients and impedance according to standards described in ISO10534-2 (1998). They are based on the Transfer Function Method, which is much faster than the commonly used Standing Wave Ratio Method.

The SW series Impedance Tubes are specially designed not only to work with the cut samples, but also for direct use in the field. The small size and durable aluminum construction make it easy to transport and be used for estimating the properties of walls, ceilings, installed building materials, road surfaces, different ground surfaces, interiors of vehicles, etc.

BSWA offers the complete set of Impedance Tube system, which includes: the tubes, microphones; DAQ hardware and measurement software.

Technical Parameters:
Value to be Measured Sound Absorption Coefficient (α) and Transmission Loss(TL)
Standard Sound Absorption Standard: GB/T-18696, 2-2002, ISO10534-2, 1998; Transmission Loss(TL) Standard in Discussion
Loud speaker 4 “ in diameter, 20 Watts, 8 Ohm
Frequency Range (Hz) 800 ~ 6300Hz
1/4’’ Microphone MPA416
Data Acquisition Card MC3242 / MC3242
Inner Diameter of Testing Tube 30 mm
Power Amplifier PA50
Software VA-Lab4 Basic + VA-Lab4 IMP-AT

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